I have really bad vibrations in the yj after 3rd gear. I took a look at my drive shaft and the angle is horrible. So my question is first off what degree shims do I need and where to get them? As far as what degree right now as it sits theres about a 3.5" suspension lift, 1.5" shackles and a 2" body lift. Eventually I want to take the body lift and maybe the shackles out so I was thinking I could buy a few different wedges so I could change the angle as I lower it. Do they sell them in sets? Ive been looking but cant seem to really find anyone that sells them. Any help would be appreciated. Thanks in advance.

What he said.. The aluminum ones will crack. Only get steel shims. You really need to crawl under your Jeep and measure the difference between your TC and pinion. For a standard slip shaft you want those measurements to be as close to parallel as possible. Also, make sure you get the type of shims that bolt under the spring pin and not slip over it.

I ran alloy shims for 4 years and only removed them because I installed an 8.8. I would loose the 1.5" shackle lift and replace it with a lift of 1" or less. I believe I was using 8* shims with no problems.

Also, make sure you get the type of shims that bolt under the spring pin and not slip over it.

What he said.

Here's a link for some shims. I'm using the 2 degree ones in my 8.8. They are steel and bolt under the center pin and even have a recessed hole so that the center pin isn't "angled."4 Wheel Drive Hardware Search-RH3

On a side note.... I'd remove the shackles first, then work on getting your axle shimmed correctly. You may decide you want to keep that 2" BL later on, especially when it comes time for new (larger) tires.

But that's just me. Body lifts and I don't see eye to eye (northern, oxidized Jeeps)

__________________
94 YJ w/ stuff. All the work/money I put into it, and the comment I get most is my $20 mod: "Hand throttle?!? That's awesome."

Quote:

Originally Posted by dmcanally

You know you drive a YJ when it is no longer getting older, but slowly becoming brand new part by part.

I have really bad vibrations in the yj after 3rd gear. I took a look at my drive shaft and the angle is horrible. So my question is first off what degree shims do I need and where to get them? As far as what degree right now as it sits theres about a 3.5" suspension lift, 1.5" shackles and a 2" body lift. Eventually I want to take the body lift and maybe the shackles out so I was thinking I could buy a few different wedges so I could change the angle as I lower it. Do they sell them in sets? Ive been looking but cant seem to really find anyone that sells them. Any help would be appreciated. Thanks in advance.

If your in Mansfield PA, I have a pile of shims you can choose from. I am maybe 30min from you.

We can't answer that question exactly. We can only give you a general zone. You may need 4 degree shims, you may need 6 degree shims. (Hopefully no more than 6.)

You need to get a driveshaft angle measuring tool, maybe something like a magnetic base protractor (shown in photo).

You need to google around "How to measure driveshaft angle." Read, read, and read some more until you understand. Shims aren't expensive, but it would be a shame to waste $20 because you did it wrong in a hurry.

took me about 3 hours (no hurry) shims cost about $30 bucks, new center pins about $15, your gonna need a floor jack, at least 2 jack stands, a couple of "C" clamps, or a few pairs of vice grips, to hold the leaf pack together when you take out the shims it makes putting the new pin in pretty easy, if your springs are still under the axle, jack from the frame and put the jack stands on the frame lift vehicle about 4 inches off the ground, set your stands, loosen the u bolts remove bottom plate, lift axle with another floor jack or by hand put in the new center pins, with the wedges, and tighten up the center pins re-align the axle so the new pins fit in the holes in the axle perch, re-install bottom plate tighten u-bolts step back take a look make sure everything looks straight, test drive... recheck all bolts after test drive make sure their still tight...done